Updated: (XERCESJ-1257) buffer overflow in UTF8Reader for characters out 2007-06-28 - By Robert Stojnic (JIRA)
[ https://issues.apache.org/jira/browse/XERCESJ-1257?page=com.atlassian
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Robert Stojnic updated XERCESJ-1257:
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Attachment: TestXerces.java
I think you could see the problem from the source alone, but anyway, here's a
test case to reproduce the problem...
> buffer overflow in UTF8Reader for characters out of BMP
> -------------------------------------------------------
>
> Key: XERCESJ-1257
> URL: https://issues.apache.org/jira/browse/XERCESJ-1257
> Project: Xerces2-J
> Issue Type: Bug
> Components: JAXP (javax.xml.parsers)
> Affects Versions: 2.9.0
> Environment: Any
> Reporter: Robert Stojnic
> Priority: Minor
> Attachments: TestXerces.java, UTF8Reader.patch
>
>
> There is a ArrayOutOfBoundsException in org.apache.xerces.impl.io.UTF8Reader,
in read(char[],int,int) for 4-byte utf-8 chars.
> Imagine a following scenario. read() has a buffer of size N, and it reads N-1
ascii chars, and stores it in the output buffer. Let the Nth char be the first
byte of a 4 byte utf-8 char. The other 3 bytes are fetched by invoking read()
on the input stream. From these a surrogate pair of java chars is made, however
, method does not check if both chars can fit into the output buffer ... In most
cases, they would fit into the ouput buffer (e.g. if there are some other multi
-byte chars in the fetched text), so the bug is very rare, but it still happens.
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